A5102879666- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Photonic and Optical Devices
- Near-Field Optical Microscopy
- Semiconductor Quantum Structures and Devices
- Semiconductor Lasers and Optical Devices
- Quantum and electron transport phenomena
- Advanced NMR Techniques and Applications
- Graphene and Nanomaterials Applications
- Photonic Crystals and Applications
- Innovations in Concrete and Construction Materials
- Integrated Circuits and Semiconductor Failure Analysis
- Graphene research and applications
- Carbon Nanotubes in Composites
- Additive Manufacturing and 3D Printing Technologies
- Nanowire Synthesis and Applications
- Manufacturing Process and Optimization
University of Basel
2014-2021
We present the experimental realization of a quantum fiber-pigtail. The device consists semiconductor quantum-dot embedded into conical photonic wire that is directly connected to core demonstrate photon collection efficiency at output fiber 5.8% and suggest realistic improvements for implementation useful in context information. also discuss potential applications scanning probe microscopy. approach generic transferable other materials including diamond silicon.
Coupling a microscopic mechanical resonator to nano-scale quantum system enables control of the via system, and vice versa. The coupling is usually achieved through functionalization but this results in additional mass dissipation channels. An alternative an intrinsic based on strain. We employ here monolithic semiconductor system. dot; trumpet which simultaneously optimizes photonic properties. dot transition driven resonantly. Via resonance fluorescence, we observe Brownian motion even at...
We demonstrate nonlinear coupling between two orthogonal flexural modes of single as-grown GaAs nanowires. The resonant frequency one mode can be shifted over many line widths by mechanically driving the other mode. present time-domain measurements and characterize it further pump-probe experiments. Measurements show that a geometric nonlinearity causes to depend directly on square amplitude Nearly degenerate in nanowires are particularly interesting given their potential use vectorial force sensing.
As the number of spins in an ensemble is reduced, statistical fluctuations its polarization eventually exceed mean thermal polarization. This transition has now been surpassed a recent nuclear magnetic resonance experiments, which achieve nanometer-scale detection volumes. Here, we measure ensembles KPF6 sample using force microscopy. In particular, investigate between regimes dominated by and The ratio two types provides detected ensemble.
We report nonlinear behavior in the motion of driven nanowire cantilevers. The nonlinearity can be described by Duffing equation and is used to demonstrate mechanical mixing two distinct excitation frequencies. Furthermore, we that amplify a signal at frequency close resonance oscillator. Up 26 dB amplitude gain are demonstrated this way.
Over the years, a number of nanoscale electric-field sensors that can image single surface charges have been developed. Due to intrinsic limitations their electrical or mechanical detection schemes, however, most operate at frequencies below 1 kHz. This study presents scanning sensor based on an optically active semiconductor quantum dot, combining exquisite sensitivity and resolution with high bandwidth. In addition demonstrating sensor's feasibility, authors lay out improvements required...
Nanowire antennas embedding a single semiconductor quantum dot (QD) represent an appealing solid-state platform for photonic technologies. We present recent work aiming at generating indistinguishable photons with this system. first investigate decoherence channels that spectrally broaden the QD emission, and discuss in particular impact of nanowire thermal vibrations. also develop optical nanocavities, which provide large acceleration spontaneous so it becomes less sensitive to environmental noises.
We present an exploration of the spectroscopy a single quantum dot in photonic wire. The device presents high photon extraction efficiency, and strong hybrid coupling to mechanical modes. use resonance fluorescence probe emitter's properties with highest sensitivity, allowing detection thermal excitation mode at 4 K.
We describe the use of grown nanowires as scanning directional force sensors. Two orthogonal flexural modes are used to demonstrate vectorial sensing electric and magnetic fields. Furthermore, we show that can be strongly coupled by demonstrating Rabi oscillations. These results open way implement coherent control frequency stabilization in nanomechanical mass